384 olvii . GrRAMiNEiE (Stapf). [DybowsJcia. 
long, those of the lower pair over 1 lin. wide, acute, glabrous ; valves 
usually more developed than in the pedicelled spikelets ; the upper 
similar to the lower but shorter and 1-nerved. — Andropogon Dy- 
bowskii, Franch. in Bull. Soc. Hist. Nat. Autun, viii. 334 (reprint 
26). A. Sereti, De Wild. Etudes FI. Bas- et MOyen Congo, iii. 
152, t. xl. Cymbopogon princeps, Stapf in Mem. Soc. Bot. France, 
viii. 104. 
North Central. French Congo: Langouani Country; Balao Camp, 60-95 
miles from the River Oubangi, Dybowski, 585 ! Upper Oubangui ; Tomi 
valley, Chevalier, 3570 ! 
South Central. Belgian Congo : Welle District ; between Missa and Congo, 
on arid, rocky plateau, Seret, 308. 
44. EXOTHECA, Anderss. in Nov. Act. R. Soc. Sc. Upsal. ser. 3, 
ii. 253, t, 3. 
Spikelets 2-nate, those of the uppermost pair differing in sex and 
very conspicuously in shape (forming with the terminal pedicelled 
spikelets a trio), those of the lower pairs homogamous (<$ and alike 
in shape), one sessile, the other pedicelled on the rhachis of paired 
racemes ; the homogamous pairs approximate, forming an involucre 
below the heterogamous trio, the axis disarticulating tardily between 
and readily above them ; raceme-pairs solitary, terminating 
the culms and their scanty usually undivided branches, rarely the 
latter forming few-rayed tiers ; the fertile spikelet falling with the 
adjacent pedicels ; joints and pedicels of the involucre very short, 
stoutly filiform, glabrous or almost so ; pedicels of the trio slender, 
filiform-linear, with truncate minutely auricled tips. Florets 2, 
lower reduced to an empty valve, upper ^ in the sessile spikelet 
of the terminal trio, $ in those of the homogamous pairs and all 
the pedicelled spikelets. Fertile spikelets dorsally convex and 
laterally rounded when in flower, terete in fruit, awned ; callus long, 
slender, pungent, shortly bearded. Glumes subequal, subcoriaceous, 
the lower with a herbaceous 2-dentate and 2-keeled beak and invo- 
lute margins below it, the upper thinner, rounded on the back with 
a large membranous finely keeled tip, 3-nerved. Valves ciliate ; 
of lower floret hyaline, 2-nerved or nerveless, of upper floret stipiti- 
form, passing into a long stout awn from between 2 short hyaline 
lobes. Valvule small, hyaline, nerveless. Lodicules 2, glabrous. 
Stigmas laterally exserted : styles terminal. Stamens 3. Grain 
clavate-oblong, subterete. Pedicelled spikelets of all pairs linear- 
to lanceolate-oblong, acute or mucronate or aristulate from the 
lower dorsally much compressed and flat or subinvolute glume, 
longer than the fertile. Valves of both florets developed. — 
Perennial, densely csespitose, with narrow blades and very scanty 
inflorescences ; spikelets large. 
Species 1, endemic. 
1. E. abyssinica, Anderss. l.c. Densely csespitose with intra- 
vaginal innovations, up to 3 ft. high. Culms erect, rather slender, 
